US4491507A
Expired / Lapsed
US
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Galvanic depositing of palladium coatings
Assignee: WC HERAEUS HERAEUSSTRASSE 12-14 6450 HANAU-MAIN W GERMANY A CORP OF GERMANY GmbH
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Filing: 1984-05-09
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Granted: 1985-01-01
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Expires: 2004-05-09
Abstract
Abstract Bright palladium coatings which are pore-free and free of fissures and have a low internal stress are produced by galvanic depositing from a bath which contains tetrammine palladium dibromide, ammonium bromide, sulfamic acid and/or ammonium sulfamate and nicotinic acid and/or nicotinamide.
Inventors
- 👤 Gunter Herklotz
- 👤 Gerhard Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:54
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/50; C25D3/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
An aqueous bath for the galvanic depositing of palladium coatings, said bath comprising 5-50 g/l of palladium as tetrammine palladium dibromide, 10-150 g/l of ammonium bromide, 10-150 g/l sulfamic acid and/or ammonium sulfamate, and 1-20 g/l of nicotinic acid and/or 0.1 mg/l to 0.5 g/l of niacinamide and has a pH of 6.5-10.
Claim 2
Dependent Claim
53 words
An aqueous bath for the galvanic depositing of palladium coatings, said bath comprising 5-50 g/l of palladium as tetrammine palladium dibromide, 10-150 g/l of ammonium bromide, 10-150 g/l sulfamic acid and/or ammonium sulfamate, and 1-20 g/l of nicotinic acid and/or 0.1 mg/l to 0.5 g/l of niacinamide and has a pH of 6.5-10.
Claim 3
Dependent Claim
13 words
The aqueous bath of claim 1, wherein the pH is 8 to 9.
Claim 4
Independent Claim
82 words
A method for the galvanic depositing of palladium coating on an article comprising immersing the article in a bath of 5-50 g/l of palladium as tetrammine palladium dibromide, 10-150 g/l of ammonium bromide, 10-150 g/l sulfamic acid and/or ammonium sulfamate, and 1-20 g/l of nicotinic acid and/or 0.1 mg/l to 0.5 g/l of niacinamide, said bath having a pH of 6.5-10 and a temperature of 20° to 50° C. and applying a current density of 0.1 to 20 amperes per square decimeter.
Claim 5
Independent Claim
82 words
A method for the galvanic depositing of palladium coating on an article comprising immersing the article in a bath of 5-50 g/l of palladium as tetrammine palladium dibromide, 10-150 g/l of ammonium bromide, 10-150 g/l sulfamic acid and/or ammonium sulfamate, and 1-20 g/l of nicotinic acid and/or 0.1 mg/l to 0.5 g/l of niacinamide, said bath having a pH of 6.5-10 and a temperature of 20° to 50° C. and applying a current density of 0.1 to 20 amperes per square decimeter.
Claim 6
Dependent Claim
13 words
The method of claim 2, wherein the bath pH is 8 to 9.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |